I found the cheapest source for the FPSS. It is Carlton Bates Company (ph. 1 866 600 6040)... they sell the same Hobbs pressure switch as all the Nitrous/performance companies.

The part numbers: 76058-30-01 (spade type electrical connections)
76053-30-01 (screw type connection)

Price is $22.00

 

They aren't a sponsor, so I don't think that you can advertise here for them. This post will probably get deleted..